#ifndef __COMM_HPP__
#define __COMM_HPP__

#include <iostream>
#include <string>
#include <cstdlib>
#include <cstring>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "log.hpp"

using namespace std;

#define FIFO_FILE "./myfifo"
#define MODE 0664

//共享内存的大小一般建议是4096的整数倍
//4097，实际上操作系统给的是4096*2的大小
const int size = 4096;
const string pathname = "/home/hd";
const int proj_id = 0x6776;
Log log;

enum{
    FIFO_CREATE_ERR = 1,
    FIFO_DELETE_ERR,
    FIFO_OPEN_ERR,

};


key_t Getkey()
{
    key_t k = ftok(pathname.c_str(),proj_id);
    if(k < 0)
    {
        log(Fatal,"ftok error: %s", strerror(errno));
        exit(1);
    }
    log(Info,"ftok sucess, key is : 0x%x",k);
    return k;
} 

int GetShareMemHelper(int flag)
{
    key_t k = Getkey();
    int shmid = shmget(k,size,flag);
    if(shmid < 0)
    {
        log(Fatal,"creat share memory error : %s",strerror(errno));
        exit(2);
    }
    log(Info,"creat share memory sucess, shmid : %d",shmid);

    return shmid;

}

int CreatShm()
{
    return GetShareMemHelper(IPC_CREAT|IPC_EXCL|0666);
}

int GetShm()
{
    return GetShareMemHelper(IPC_CREAT);
}

class Init
{
public:
    Init()
    {  
        //创建管道
        int n = mkfifo(FIFO_FILE,MODE);
        if(n == -1)
        {
            perror("mkfifo");
            exit(FIFO_CREATE_ERR);
        }
    }

    ~Init()
    {
        int m = unlink(FIFO_FILE);
        if(m == -1)
        {
            perror("unlink");
            exit(FIFO_DELETE_ERR);
        }
    }
};


#endif